A textual publication that can contain pictures, videos and links.
JPG, PNG, or GIF
Video in MP4 format or a link to YouTube, Vimeo, Dailymotion, etc.
A selection of images by subject or event
Post to Facebook, a post from Vkontakte, tweet, etc.
How well do you know about ...?
One or more questions on a topic or about someone.
A poll in which both answers are equally strong. Can be used for polls in the format of who is steeper, which is better, etc.
"Like it or not"
A poll in which there are two opposite answers.